Full duplex operation in wireless systems

Abstract

A method and apparatus for providing for full-duplex (FD) operation in time division duplex (TDD) communications are disclosed herein. A wireless transmit/receive unit (WTRU) may receive an indication of a first, UL heavy, TDD uplink (UL)/downlink (DL) configuration and an indication of a second, DL heavy, TDD UL/DL configuration. The WTRU may also receive a grant in a common DL subframe. The WTRU may apply the hybrid automatic repeat request (HARQ) process timing associated with one of the TDD UL/DL configurations for DL HARQ feedback. Also, the WTRU may monitor a set of subframes for a UL or a DL grant. Further, the WTRU may receive a grant in a subframe which may include an indication of a reference TDD UL/DL configuration. The WTRU may then apply the HARQ process timing associated with the reference TDD UL/DL configuration for DL HARQ feedback.

What is claimed is: 
     
       1. A wireless transmit/receive unit (WTRU) comprising:
 a transceiver and a processor, wherein the transceiver and the processor are configured to: 
 receive first time division duplex (TDD) configuration information, wherein the WTRU determines time intervals for downlink communication, time intervals for uplink communication, and time intervals for uplink and downlink communication based on the first TDD configuration information; 
 receive a second TDD configuration information, wherein the WTRU determines time intervals for downlink communication, time intervals for uplink communication, and time intervals for uplink and downlink communication based on the second TDD configuration information; 
 receive a grant for an uplink transmission in a first time interval determined to be downlink based on the first TDD configuration information and the second TDD configuration information, wherein the grant indicates a hybrid automatic repeat request (HARQ) process for uplink transmission; and 
 transmit using the indicated HARQ process in a second time interval determined to be uplink based on the first TDD configuration information and the second TDD configuration information. 
 
     
     
       2. The WTRU of  claim 1 , wherein the first TDD configuration information is cell-specific. 
     
     
       3. The WTRU of  claim 1 , wherein the second TDD configuration information is WTRU-specific. 
     
     
       4. The WTRU of  claim 1 , wherein the first TDD configuration information is received in a system information block (SIB). 
     
     
       5. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
 receiving first time division duplex (TDD) configuration information, wherein the WTRU determines time intervals for downlink communication, time intervals for uplink communication, and time intervals for uplink and downlink communication based on the first TDD configuration information; 
 receiving a second TDD configuration information, wherein the WTRU determines time intervals for downlink communication, time intervals for uplink communication, and time intervals for uplink and downlink communication based on the second TDD configuration information; 
 receiving a grant for an uplink transmission in a first time interval determined to be downlink based on the first TDD configuration information and the second TDD configuration information, wherein the grant indicates a hybrid automatic repeat request (HARQ) process for uplink transmission; and 
 transmitting using the indicated HARQ process in a second time interval determined to be uplink based on the first TDD configuration information and the second TDD configuration information. 
 
     
     
       6. The method of  claim 5 , wherein the first TDD configuration information is cell-specific. 
     
     
       7. The method of  claim 5 , wherein the second TDD configuration information is WTRU-specific. 
     
     
       8. The method of  claim 5 , wherein the first TDD configuration information is received in a system information block (SIB). 
     
     
       9. The WTRU of  claim 1 , wherein the first time interval has a duration of one or more consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols and the second time interval has a duration of one or more consecutive OFDM symbols. 
     
     
       10. The WTRU of  claim 1 , wherein the second TDD configuration information is dynamic. 
     
     
       11. The method of  claim 5 , wherein the first time interval has a duration of one or more consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols and the second time interval has a duration of one or more consecutive OFDM symbols. 
     
     
       12. The method of  claim 5 , wherein the second TDD configuration information is dynamic.